. The chordates. Chordata. laiyl :Cocc B Fig. 465. Dog skull. (A) Dorsal view. (B) Ventral view. () Fossa for articulation of lower jaw; () occipital condyle; (F) frontal; (Finf) infraorbital foramen; {Jg) jugal (malar); (Jm) premaxillary; (L) lacrimal; (M) maxillary; (TV) nasal; {) basioccipital; (P, in A) parietal; (P, in B) palatine; (Pjt) zygomatic process of temporal; {PI) pterygoid; {Sph) alisphenoid; {Sph') basi- sphenoid; {Sph") presphenoid; {) supraoccipital; {T) tympanic bulla of temporal; {Vo) vomer. (Courtesy, Wiedersheim: "Grundriss der v
. The chordates. Chordata. laiyl :Cocc B Fig. 465. Dog skull. (A) Dorsal view. (B) Ventral view. () Fossa for articulation of lower jaw; () occipital condyle; (F) frontal; (Finf) infraorbital foramen; {Jg) jugal (malar); (Jm) premaxillary; (L) lacrimal; (M) maxillary; (TV) nasal; {) basioccipital; (P, in A) parietal; (P, in B) palatine; (Pjt) zygomatic process of temporal; {PI) pterygoid; {Sph) alisphenoid; {Sph') basi- sphenoid; {Sph") presphenoid; {) supraoccipital; {T) tympanic bulla of temporal; {Vo) vomer. (Courtesy, Wiedersheim: "Grundriss der vergleichenden Anatomie der Wirbeltiere," Jena, Gustav Fischer.) a strong process of the squamosal. The middle span of the arch is the jugal, in mammals known as the "; This remnant of a tem- poral arcade is called the zygomatic arch. In the anapsid skull the great muscles which elevate the lower jaw occupy the space between the side of the cranium and the temporal arcade. In the mammal the masseter muscle extends from the zygomatic arch to the lower jaw (Figs. 454, bottom; 460). The large space between the arch and the cra- nial wall is occupied by the temporalis, a bulky muscle which arises from an extensive area on the temporal region of the cranium (Fig. 460) and inserts on a prominent dorsal coronoid process (Fig. 4365) of the lower jaw. When the mouth is closed, the coronoid process, surrounded on all sides by the muscles which attach to it, extends up into the temporal space. Therefore the outer surface of the masseter (cheek- muscle) and the considerable area of the temporalis extending above it are covered externally only by the skin and some thin sheets of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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